parsing author name for book inventory prog

I have wrote a string that will extract first, middle, and last names from a string but it doesn't seem to work here is some code:

Code:

void Author::parse_name(string tauthor){
    const string delims(" \t");
    int begIdx,endIdx,tIdx;
    //search for beginning of first word
    begIdx=tauthor.find_first_not_of(delims, begIdx);
    //while beginning of word found
    if (begIdx!=string::npos){
        // end or word
        endIdx=tauthor.find_first_of(delims,begIdx);
        first_name=tauthor.substr(begIdx,(endIdx-begIdx));
        
        begIdx=tauthor.find_first_not_of(delims,endIdx);
        
        if (begIdx!=string::npos){
                endIdx=tauthor.find_first_of(delims,begIdx);
                tIdx=tauthor.find_first_not_of(delims,endIdx);
                // if tIdx is at end of tauthor string only first,last are given
                if (tIdx=string::npos)
                    last_name=tauthor.substr(begIdx,endIdx-begIdx);
                else
                    middle_name=tauthor.substr(begIdx,endIdx-begIdx);
                
                //extract lastname
                begIdx=tauthor.find_first_not_of(delims,endIdx);
                endIdx=tauthor.length();
                last_name=tauthor.substr(begIdx,endIdx-begIdx);
        }            
    }
    else{
         first_name="";
         middle_name="";
         last_name="";
    }
       
}

the constructor for the Author class

Code:

Author::Author(string tauthor){
    parse_name(tauthor);
    cout << first_name<<endl;
    cout << last_name<<endl;
    cout << middle_name<<endl;
    
}

finally my little main test

Code:

#include <iostream>
using std::cout;
using std::cin;

#include <stdlib.h>

#include "book.h"
#include "author.h"

int main(int argc, char *argv[])
{
  Book Fiction("The Once and Future King");
  cout << Fiction;
  cin >>  Fiction;
  cout << Fiction;
  Author SomeGuy("Jon Monroe Stevens");
      
  system("PAUSE");	
  return 0;
}

I figured it out here is the working function:

Code:

void Author::parse_name(string tauthor){
    const string delims(" \t");
    int begIdx,endIdx,tIdx=0;
    //search for beginning of first word
    
    begIdx=tauthor.find_first_not_of(delims,0);
    
    //while beginning of word found 
    if (begIdx!=string::npos){
        // end or word
        endIdx=tauthor.find_first_of(delims,begIdx);
        first_name=tauthor.substr(begIdx,(endIdx-begIdx));
        begIdx=tauthor.find_first_not_of(delims,endIdx);
        
        if (begIdx!=string::npos){
                endIdx=tauthor.find_first_of(delims,begIdx);
                tIdx=tauthor.find_first_not_of(delims,endIdx);
                // if tIdx is at end of tauthor string only first,last are given
                if (tIdx!=string::npos)
                {
                   middle_name=tauthor.substr(begIdx,endIdx-begIdx);
                   //extract lastname
                   begIdx=tauthor.find_first_not_of(delims,endIdx);
                   endIdx=tauthor.length();
                               
                   last_name=tauthor.substr(begIdx,endIdx-begIdx);
                }
                else
                {
                    last_name=tauthor.substr(begIdx,endIdx-begIdx);
                    middle_name="";
                }
        }            
    }
    else{
         first_name="";
         middle_name="";
         last_name="";
    }
       
}